show filenames in grid and download file in silverlight

//in xaml.cs
public void BtnDownload_click(object sender, EventArgs e)
{
 var currentRow = dgDownloadFile.SelectedItem;
 string sFileName = currentRow.ToString();
 string sFullPath = "C:/FilesToDownload/" + sFileName;  //file path from where you want to download file

 Service1Client proxy = new Service1Client();

 proxy.DownloadFileCompleted += new ventHandler<DownloadFileCompletedEventArgs>(proxy_DownloadFileCompleted);

 proxy.DownloadFileAsync(sFullPath);  //wcf service client
}



void proxy_DownloadFileCompleted(object sender, DownloadFileCompletedEventArgs e)
{
 if (e.Result == 1)
   MessageBox.Show("Download successfully.");
 if(e.Result == 2)
   MessageBox.Show("File already exists.");
}




//in WcfService
[WebMethod]
public int DownloadFile(string FullPath)
{
 string[] fn = FullPath.Split('/');  //get your filename
 FileStream fileStream = null;
 BinaryReader reader = null;
 fileStream = new FileStream(FullPath, FileMode.Open, FileAccess.Read);
 reader = new BinaryReader(fileStream);
 byte[] fileeBytes = reader.ReadBytes((int)fileStream.Length);
 string DownloadPath = "C:/Documents/" + fn[2];  //for download in C:/Documents
 if (!File.Exists(DownloadPath))
 {
  FileStream outputStream = new FileStream(DownloadPath, FileMode.Create);
  outputStream.Write(fileeBytes, 0, fileeBytes.Length);
  outputStream.Close();
  return 1;
 }
 else
 {
  return 2;
 }
}

//you need to add following files.
clientaccesspolicy.xml


<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="SOAPAction">
        <domain uri="https://*" />
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true" />
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>


crossdomain.xml


<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
  <allow-http-request-headers-from domain="*" headers="SOAPAction,Content-Type" />
</cross-domain-policy>